﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Demo02
{
    class Circle:Shape
    {
        public double radius;

        public double Radius
        {
            get { return radius; }
            set { this.radius = value; }
        }
        public override void GetArea(Double radius)
        {
           
           

           
            Console.WriteLine(3.14 * radius * radius);
        }
    }
}
